Merge tag 'staging-3.11-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging driver fixes from Greg KH:
 "Here are 3 small fixes for staging/IIO drivers for 3.11-rc5.  Nothing
  huge, two IIO driver fixes, and a zcache fix.  All of these have been
  in linux-next for a while"

* tag 'staging-3.11-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging: zcache: fix "zcache=" kernel parameter
  iio: ti_am335x_adc: Fix wrong samples received on 1st read
  iio:trigger: Fix use_count race condition

5 files changed, 66 insertions, 23 deletions

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 0ad208a69c29..3ceac3e91dde 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -60,7 +60,6 @@ static void tiadc_step_config(struct tiadc_device *adc_dev)
 {
         unsigned int stepconfig;
         int i, steps;
-        u32 step_en;
 
         /*
          * There are 16 configurable steps and 8 analog input
@@ -86,8 +85,7 @@ static void tiadc_step_config(struct tiadc_device *adc_dev)
                 adc_dev->channel_step[i] = steps;
                 steps++;
         }
-        step_en = get_adc_step_mask(adc_dev);
-        am335x_tsc_se_set(adc_dev->mfd_tscadc, step_en);
+
 }
 
 static const char * const chan_name_ain[] = {
@@ -142,10 +140,22 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
                 int *val, int *val2, long mask)
 {
         struct tiadc_device *adc_dev = iio_priv(indio_dev);
-        int i;
-        unsigned int fifo1count, read;
+        int i, map_val;
+        unsigned int fifo1count, read, stepid;
         u32 step = UINT_MAX;
         bool found = false;
+        u32 step_en;
+        unsigned long timeout = jiffies + usecs_to_jiffies
+                                (IDLE_TIMEOUT * adc_dev->channels);
+        step_en = get_adc_step_mask(adc_dev);
+        am335x_tsc_se_set(adc_dev->mfd_tscadc, step_en);
+
+        /* Wait for ADC sequencer to complete sampling */
+        while (tiadc_readl(adc_dev, REG_ADCFSM) & SEQ_STATUS) {
+                if (time_after(jiffies, timeout))
+                        return -EAGAIN;
+                }
+        map_val = chan->channel + TOTAL_CHANNELS;
 
         /*
          * When the sub-system is first enabled,
@@ -170,12 +180,16 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
         fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
         for (i = 0; i < fifo1count; i++) {
                 read = tiadc_readl(adc_dev, REG_FIFO1);
-                if (read >> 16 == step) {
-                        *val = read & 0xfff;
+                stepid = read & FIFOREAD_CHNLID_MASK;
+                stepid = stepid >> 0x10;
+
+                if (stepid == map_val) {
+                        read = read & FIFOREAD_DATA_MASK;
                         found = true;
+                        *val = read;
                 }
         }
-        am335x_tsc_se_update(adc_dev->mfd_tscadc);
+
         if (found == false)
                 return -EBUSY;
         return IIO_VAL_INT;
diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c
index ea8a4146620d..0dd9bb873130 100644
--- a/drivers/iio/industrialio-trigger.c
+++ b/drivers/iio/industrialio-trigger.c
@@ -127,12 +127,17 @@ static struct iio_trigger *iio_trigger_find_by_name(const char *name,
 void iio_trigger_poll(struct iio_trigger *trig, s64 time)
 {
         int i;
-        if (!trig->use_count)
-                for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++)
-                        if (trig->subirqs[i].enabled) {
-                                trig->use_count++;
+
+        if (!atomic_read(&trig->use_count)) {
+                atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
+
+                for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
+                        if (trig->subirqs[i].enabled)
                                 generic_handle_irq(trig->subirq_base + i);
-                        }
+                        else
+                                iio_trigger_notify_done(trig);
+                }
+        }
 }
 EXPORT_SYMBOL(iio_trigger_poll);
 
@@ -146,19 +151,24 @@ EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll);
 void iio_trigger_poll_chained(struct iio_trigger *trig, s64 time)
 {
         int i;
-        if (!trig->use_count)
-                for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++)
-                        if (trig->subirqs[i].enabled) {
-                                trig->use_count++;
+
+        if (!atomic_read(&trig->use_count)) {
+                atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
+
+                for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
+                        if (trig->subirqs[i].enabled)
                                 handle_nested_irq(trig->subirq_base + i);
-                        }
+                        else
+                                iio_trigger_notify_done(trig);
+                }
+        }
 }
 EXPORT_SYMBOL(iio_trigger_poll_chained);
 
 void iio_trigger_notify_done(struct iio_trigger *trig)
 {
-        trig->use_count--;
-        if (trig->use_count == 0 && trig->ops && trig->ops->try_reenable)
+        if (atomic_dec_and_test(&trig->use_count) && trig->ops &&
+                trig->ops->try_reenable)
                 if (trig->ops->try_reenable(trig))
                         /* Missed an interrupt so launch new poll now */
                         iio_trigger_poll(trig, 0);
diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index dcceed29d31a..81972fa47beb 100644
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -1811,10 +1811,12 @@ static int zcache_comp_init(void)
 #else
         if (*zcache_comp_name != '\0') {
                 ret = crypto_has_comp(zcache_comp_name, 0, 0);
-                if (!ret)
+                if (!ret) {
                         pr_info("zcache: %s not supported\n",
                                         zcache_comp_name);
-                goto out;
+                        ret = 1;
+                        goto out;
+                }
         }
         if (!ret)
                 strcpy(zcache_comp_name, "lzo");
diff --git a/include/linux/iio/trigger.h b/include/linux/iio/trigger.h
index 3869c525b052..369cf2cd5144 100644
--- a/include/linux/iio/trigger.h
+++ b/include/linux/iio/trigger.h
@@ -8,6 +8,7 @@
  */
 #include <linux/irq.h>
 #include <linux/module.h>
+#include <linux/atomic.h>
 
 #ifndef _IIO_TRIGGER_H_
 #define _IIO_TRIGGER_H_
@@ -61,7 +62,7 @@ struct iio_trigger {
 
         struct list_head                list;
         struct list_head                alloc_list;
-        int use_count;
+        atomic_t                        use_count;
 
         struct irq_chip                 subirq_chip;
         int                             subirq_base;
diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
index 8d73fe29796a..db1791bb997a 100644
--- a/include/linux/mfd/ti_am335x_tscadc.h
+++ b/include/linux/mfd/ti_am335x_tscadc.h
@@ -113,11 +113,27 @@
 #define CNTRLREG_8WIRE          CNTRLREG_AFE_CTRL(3)
 #define CNTRLREG_TSCENB         BIT(7)
 
+/* FIFO READ Register */
+#define FIFOREAD_DATA_MASK (0xfff << 0)
+#define FIFOREAD_CHNLID_MASK (0xf << 16)
+
+/* Sequencer Status */
+#define SEQ_STATUS BIT(5)
+
 #define ADC_CLK                 3000000
 #define MAX_CLK_DIV             7
 #define TOTAL_STEPS             16
 #define TOTAL_CHANNELS          8
 
+/*
+* ADC runs at 3MHz, and it takes
+* 15 cycles to latch one data output.
+* Hence the idle time for ADC to
+* process one sample data would be
+* around 5 micro seconds.
+*/
+#define IDLE_TIMEOUT 5 /* microsec */
+
 #define TSCADC_CELLS            2
 
 struct ti_tscadc_dev {